Die head



Aug. 7, 1923.

, 1,464,177 W. H. GATES DIE HEAD Filed June l0, 1921 2 Sheets-Sheet l INVENTOR ATTORNEY Aug. 7,1923.

Filed June l0 1921 2 Sheets-Sheet 2 lilmll.

' INVENTOR Ammin unan.

yApplication iiled June l0, 1921. Serial No. 475,387.

will enable others skilled in the art to which it appertains to make andV use 'the same.

lilly invention relates to that classY oitl thread cutting; tools ot the character known in the tradeias dieheadsf7 it being" an improvement on the patent -grantedto me llo-` vember 9, 1920, No. 1,358,074. ln my former patent, the die actuating cam, studs were anchored to a shell having a sliding movement over the die carrying` head, and the meansior holding` the die head against rotation comprised a pin anchored in the shank et the die head with its projecting ends intended to have av free movement in elongated slots in the sides oi? the hollow shank. oit' the overhanging bracket. rlhis arrangement was located so close to the axis oir' the die head that 'the grip'oi' the dies on the work would produce suoli a torsional strain on the pin that the dies would cramp and would not readily let go or the work when the end of the thread was reached.

ln my present invention, the shell is yanehored'to the die carrying head, and has means provided thereon iorireely embracing; the sides ofthe overhanging bracket, and they are located so far 'from the anis oit the die head as to eliminate all torsional strain. `ln the present invention, the die i actuating cam'studs are anchored in a iroln lower having ar longitudinal movement within the stationaryshell.

Referring to the drawings wherein the same characters'or reference indicate like parts throughout the several views;

Figure l represents a ront'elevation of the die head showing thethreading dies closed;

.Figure 2 isfa front `elevation of the die head showing the dies opened;

Figure 3 isa sideelevation of the die head showing Vthe position of the several operative members when the dies are closed, also broken view partly in section ofthe loracketslianlr; i

l the die Figure 5 is a rear elevation of the die ead on line 5-5 0i Figure 3;

Figure 6 is a rear elevation of the cani stud rollower plate, die head carrier and its shank;

TIT 1 i iguie cam stud Figure 7 is a detail inside elevation ot the follower; i

8 is an inside detail elevation of h head carrier, locking bolt and springs;

Figure 9 is a detail side elevation or the die head carrier and locking bolt;

Figure l0 is a sectional view of several or the operative members of the die head, and broken view of the shank ,of the die head carrier on line 10-1G of Figure 1;

Figure il is adetail view of the-cam lever; l

lfigure l2 are detailed views oi a threading die and a cani stud;

Figure i3 is a broken reduced front ele-k vation of the stationary shell, end viewof theI overhanging bracket, showing modified means for operatively connectingthe shell to the bracket, and

Figure le is ay reduced plan view of the die carrying` head and Shell, and broken view of the bracket, showing modiied means for operatively connecting the head with the bracket. i A Y l represents the head carrying the. radially operating dies 2. 3 isthe usual iront plate secured to the head by the screws 4.

rthe sliell is mounted on a part of the head E. and is secured thereto hy the screws 6. The

. upwardly extended' projections 7 or' the shell freely embrace the sides oi the overhanging Varm 8 of the bracket 9 whose hollow shank l0 is adapted to be secured in a turret head or other like carrier, not shown, ier actuating' the die head to and "from the work. The shank ll oi the lie-ed l has a free longitudinal movement in the hollow sha-nk 10, and

tween 'the projection 13 and thescrew head 16 on the forward travel ot the die head 'for the purpose ot returningsaid die head atthe `completion oi' its. work, while the sp l2 will allow the die head to give back slightly and thus prevent the forcible contact of the l dies with the work.'

The follower 17 carries the studs 18 having thecams 19, Figure 12, on their forward ends registering with the cam grooves 2O formed in the sides of the'dies '2. These studs are adapted to pass Vfreely through the holes 21, F igureS, of the die carrying head 1. The cam stud follower 17 has the large centralv opening 22, Figure 7, adapted'to slide freely on the hub 23, Figures 10 and 11, of

the cam lever 24. The trip lever 25, Figure 7, is journaled on the pin26 located within the follower, and is adapted 'to engage Awith the notch 27, Figure V9, of the locking bolt 28 adjustably located in the head l'by theV screw 30. The 'trip lever 25and its spring 31 was carried, in my former patent, by the sliding shell, but is now located, as before mentioned, inthe follower, 1

32, Figure 6.isa plate adapted to be AsecuredV to the rear face of the follower 17,

and its central` opening corresponds in' diameter `to the opening" 22 of the follower.- i

' The opening 34,l in the plate, is in alignment with thexlo'clring bolti28, of the head 1, to

give fthe proper end clearance to ,said bolt.

Y The opening 34 in follower, Figure f, also affords a free passage for the bolt.

y185,"Figures 3, 4, and 8, are springs locatedV inthe holes 36V of the head 1, and 37,V Figure 7, are corresponding holes through the follower 17 in which the opposite ends of the springs are located andrest against the inside face of the plate 32 when the die head is assembled.

*The trip pin 38 is mounted in theV arm of the bracket, Aand is adjusted therein with respect to the trip lever 25 by the'screw 39, and the nut 40 secures said pin in any of its grooves 48 adapted to engage with the projecting endsV of 'the pin 44 located in the -shank 11. The spring actuated stop pin 45, seen also'in Figure 3, is adaptedto Ybe engaged by the shoulder 4G of the cam lever jpin ibi.'

In Voperating the device, the assembled dieV head is advanced throughV the medium of a Vturret head, not shownftoward the work to he threaded,jand during suchadvance, the

extension 24a, of the cam lever 24, will engage with a stationary projection, not shown, inline with theforward movementrof the diejhead and cause the 'cam lever to rotate Vtoward the arm 8 of the'bracket and into thefposition shown 'in Figures 1, 3, 5, and 10. This rotative movement ofthe cam lever will advance the follower 17 with its cam ,studs 18 to close the dies in readiness to engage the work to be threaded. rllhe thread cutting'will continue a predetermined dis- Y tance due to the position of the trip pin 3 8,

when said prin will be engaged bythe trip lever 25 and release said lever from its engagement with thenotch 27 of the'vlocliing bolt, whereupon the springs 35 will force theV follower back into itsVV normal openv po-k sition shownin Figure A4. This reverse movement of the follower will also cause a.

reverse `movement 4of the cam lever 24 into itsnormalopen' positionshown in Figures K 2 and4. As soon as the follower is released, the stored upl ten-sion inthe spring 15 will instantly'return the die head. and its shank.

One ofthe principal features ofthe preshold myself at liberty to use. In Figure 13 the single member 48 is secured tothe over! hang 8 0f the bracket 9 and projects into the elongated slot 49 of the shell 5. In Figure 14, theoverhang 8, and the slot-50, inV which the trip pin 38 is adjustably located, are ex-V tended over the die carrying head 1 so as to permit the projection 51 ofV the head to enter the slot and have a free-,longitudinal movement therein Y when said head is advanced or retracted.'V

Having thus described I claim is y Y 1. InY combination with a die head carry,-

iny invention what ing.radially operating dies, a shell embrac-,

ing a part of thehead and secured thereto, a followerv operatively 'mounted in the shell carrying cam vstuds engaging the dies, a trip lever onthe follower, a locking bolt carried by the head, an overhanging bracket, a canilever for actuating the follower to close the dies and engage the trip leverwith the lockingV bolt, means carried by the bracket to engage the trip lever and release thefol-V 4lower from the die head, and means carried by the shell adapted tok engage the. bracket to hold the head against rotation. A

2j A'diehead carrying radially operating dies, a shell embracing the die head and im- 90 ent construction, as before mentioned, is to Y movably secured thereto, a follower operatively located Within the shell and carrying die actuating cam studs, and external means engaging the shell to holcl the head against rotation.

3 A die head having a shank and carryinfr radially operating dies, a shell partially embracing the heacl anol secured thereto, a follower operatively locatecl Within the shell ancl carrying die actuating cani stnols7 a cani lever rotatably monntecl on the shanlr in workable relation with the follower anol havingn internal cam connection with the shanlr rvherehy the follower is actuated to close the c ies.

el. A die head carrying radially operating clics, a stationary shell, a follower operatively located Within the shell and carrying die actuating' cam studs, means for actuating the follower to closev the dies7 means for loching" the follower when the olies are closed, means for releasing* the follower, and means substantially as shown to hold the head against rotation.

5. A dieliead carrying radially operating dies, a shell partially embracing the head anol secured thereto, a follower operatively located Within the overhanging portion oi? the shell and carrying olie actuating cam studs, and means sulostantially as shown for holding1 the die heacl against rotation.

6. A diehead carryingn radially operatingdies, a stationary shell, a follower operatively located Within the shell and carrying die actuating cani stools, and means eXtei`- nally located with respect to the head adapted to hold saicl lieaol against rotation.

ln testimony whereof l aliiX my signature.

mWllDLllAll/l HERBERT GATES. 

